Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: airlines and hours on this route all land within a few points of 9 in 10 on time.

Nonstops (seasonal or thin)


Alaska	SEA	SUN	1h 36m	90%	1.0%	417	Flying now
Delta	SEA	SUN	1h 52m	87%few flights	0.0%	38	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Hailey on time. Total trip = scheduled departure to arrival, layover included (Hailey is 1 h ahead of Seattle). Layovers up to 4 hours. Pick a connection for the details.


United Details →	SEA 06:00 → LAX 08:44UA 1692	1h 18m Los Angeles	LAX 10:02 → SUN 13:16UA 5980 · flown by SkyWest	6h 16m	96%	96%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	2h 45m Salt Lake City	SLC 11:15 → SUN 12:29DL 3973 · flown by SkyWest	5h 59m	98%	90%
Delta Details →	SEA 07:15 → SLC 10:23DL 2858	3h 02m Salt Lake City	SLC 13:25 → SUN 14:34DL 3689 · flown by SkyWest	6h 19m	99%	87%
United Details →	SEA 05:00 → DEN 08:43UA 2601	3h 01m Denver	DEN 11:44 → SUN 13:47UA 5554 · flown by SkyWest	7h 47m	99%	86%
United Details →	SEA 13:30 → SFO 15:48UA 737	3h 07m San Francisco	SFO 18:55 → SUN 21:51UA 5986 · flown by SkyWest	7h 21m	96%	74%
United Details →	SEA 12:50 → DEN 16:42UA 1351	2h 43m Denver	DEN 19:25 → SUN 21:26UA 5734 · flown by SkyWest	7h 36m	98%	63%
Tight connection: often missed
United Details →	SEA 15:33 → SFO 17:47UA 2866	1h 08m San Francisco	SFO 18:55 → SUN 21:51UA 5986 · flown by SkyWest	5h 18m	61%	47%
United Details →	SEA 14:33 → DEN 18:22UA 333	1h 03m Denver	DEN 19:25 → SUN 21:26UA 5734 · flown by SkyWest	5h 53m	71%	45%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

SLC · 52m · leaves 07:15 7%

Afternoon and evening

SFO · 1h 08m · leaves 15:33 39%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Alaska AS 696 SEA 13:38 → LAX United UA 6043 LAX 18:45 → SUN Connection details →	2h 20m	7h 23m	96%	91%
Alaska AS 368 SEA 14:45 → SLC Delta DL 3985 SLC 21:05 → SUN Connection details →	3h 17m	6h 24m	95%	90%
Alaska AS 292 SEA 07:18 → SLC Delta DL 3689 SLC 13:25 → SUN Connection details →	2h 58m	6h 16m	96%	86%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON